I didn't think it would work. This one worked for me.
Thanks, and to whoever posted that answer. Clever guy!
I was starting to get an headache over this issue. Thanks!
OMG thank you! You are a lifesaver!
The best set of directions I've ever heard. Thank you.
Other:

This is NOT abusive. I pressed this button by accident.It is spam / self promotion.It is offensive or harmful.It does not contain enough information.It contains or requests illegal information.It does not make sense.

If your tablet is frozen, try to force it to shut down by pressing on the Power button for 10 to 30 seconds.
If it does not shut down, try to remove the battery if you can. But if you are not able to remove the battery, you can leave it to drain until it is empty.

Recharge it then start it up again. If you will see just the Android logo and you cannot do anything on your tablet, you need to perform a factory data reset. But this will delete all data on your device so you need to backup files.

You were not able to tell what model and brand of tablet you are using. If you can reply with the model and brand, I can show you how to perform a factory data reset.
If you cannot make it work, you can also bring your device to the nearest service center of your tablet`s manufacturer.

That depends to to the tabet that you are using. There are some tablets that does nt have a front camera.

Facebook video call requires your tablet to have front camera to be able to do video calling. it is a standard requirement. Tendency that you can see the other person but the other person may not be abe to see you.

This feature does not require you to have an application to be install on the tablet.

You can simply go to your browser and logon to facebook.com and login with your credentials.

Go to your list of friends and tap or select the Camera icon on chat box to start the video call.

You should have told what your tablet model is so I can help you further. But I will still try to help you with the generic troubleshooting which is hard reset, this did not worked you might need to flash your table`s firmware.

To hard reset.

1. Power off the tablet by pressing power button for 10-15 sec.
2. Press and hold volume down and power button at the same time till you see the recovery screen.
3. Use volume down to select Wipe data/Factory reset.
4. Press Power button to accept the selection.
5. Select YES on the next screen.
6. Select Reboot after the reset.

Remember that to do a hard reset all information you have on the phone will be erased and the phone would be with the manufactures configuration. Follow the following steps:
1. from your screen, press the following: *2767*3855#
2. the reset will initiate and this will take about 3 minutes.
3. Once rebooted you can add a new password, I recommend that you write it down and store it somewhere safe just in case you forget it don`t have to reset your phone again.
Sigue los siguientes pasos:
1. desde tu pantalla, marca lo siguiente: *2767*3855#
2. el reset se iniciara y esto tardara unos minutos
3. Una vez reiniciado el telefono podras volver a poner una contraseña

Translate:
To make a video call on facebook using your tablet you need to install a third party software. I suggest to download "Seen : Video Calls for facebook" It easy to use and it has a user friendly GUI.

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